ACT Science 4.3 Research Summary Passage
ACT Science: Research Summary Passage Drill 4, Problem 3. What does the band marked C weigh closest to?
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And here are the potential answers…
Sounds like we’re being asked to read the figure and determine the weights of the proteins
shown—especially one in particular, right here: C.
The key running up the left edge of the chart gives the weight of the proteins in--
“kilodaltons,” if you’re fancy that's kDa. A Dalton is a very, very, very, very, very,
very tiny unit of mass measurement named after John Dalton.
We’re talking atomic-level, phenomenally tiny masses.
But that’s the nature of the beast when we’re dealing with something as tiny as proteins.
Anyhow, here we have protein C, and by following along to the key…
…we can see that protein C weighs about 90 kilodaltons.
So C’s our answer.
A far cry from Dalton’s daltons, indeed.